Trolley-harp.



PATENTED JAN. 14, 1903.

' B. L. DRESSER.

TROLLEY HARP.

APPLICATION FILED MAR. 19.1907.

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BENJAMIN L. DRESSER, OF UXBRI DGE, ASSAOHUSETTS] TROLLEY-HARP.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed March 19. 1907- Serial No. 863.182-

To all whom it may concern:

Be it known that I, BENJAMIN L. DRESSER, a citizen of the United States,residing at Uxbridge, in the county of WVorcester and State ofMassachusetts, have invented certain new and useful Improvements inTrolley-Harps, of which the following is a specification.

This invention contemplates certain new and useful improvements introlley-poles and harps, and the invention has for its object animproved detachable connection between a trolley-pole and its harpwhereby the latter may be quickly attached to or detached from theformer.

The invention also embodies improvements relating particularly to thetrolleyharp for which Letters Patent of the United States were issued tome August 28, 1906, N 0. 829,390.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result, reference is to be had to the followingdescription and accompanying drawings, in which:

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Figure 1 of the drawings represents a vertical section of the device.Figs. 2, 3 and 4 illustrate the means for attaching the trolley head tothe pole.

Referring to the drawings, the numeral 1 designates a trolley-pole whichis provided at one end with a reduced shank 2 and 4f designates a harpwhich embodies complemental plates or members clamped together in spacedrelation so as to receive the shank 2 between them and adapted to extendin a divergent manner beyond the said shank so as to constitute the yokein which the trolley wheel 5 is journaled. The spindle 6 of the trolleywheel is shown mounted in the outer ends of the harp, and a pair ofoutside springs 7 are apertured at their outer ends to receive thesquared ends of the spindle and are adapted to hold the said spindle inplace as against longitudinal displacement.

8 designates a pair of inside leaf springs that are located on oppositesides of the trolley wheel 5 and are formed at their outer ends withapertures to receive the spindles 6. The above described construction isset forth in detail in the schedule of my said Letters Patent, to whichreference may be had.

My present invention comprehends parsary to slip the harp over the shank2 which will effect thecontraction of the hooks 9 or force their outerhooked ends 10 toward each other and hold them in contracted relationuntil the harp shall have been slipped over the shank-to its limit,whereupon the said hooks are permitted to spring outwardly and engagewith the outwardly facing shoulders 11 of the inner sides of the harpmembers so as to effect a secure connectionbetween the harp and pole. Inthis relation of the parts the lower end of the harp preferably abutsagainst the shoulder formed by the reduced shank 2.

It is to be understood that the shank 2 and the socket that is formedwithin the harp to receive it, may be made of any cross sectionaloutline either round or rectangular and that the invention is applicableto any ordinary form of harp as well as the patented harp referred to.For instance as shown in Fig. 3, 4 designates an ordinary harp with around bore or socket and it will be seen by reference to said figurethat my improved pole with its spring hooks 9 may be inserted into saidsocket so as to permit the hooks to spring outwardly at the fork end ofthe harp and thereby securely hold the harp to the pole.

As illustrated in Fig. 4 the ordinary type of harp 4 may be formed witha square socket or bore to receive the square end of the shank of thepole.

To detach the harp from the pole it is only necessary for the trainmanto grasp the hooked ends 10 between his thumb and linger and ress theminwardly which will result in re easing the hooks from engagement withthe harp and permit the latter to be slipped off the pole.

From the foregoing description in con nection with the accompanyingdrawing, it

will be seen that I have provided a very simple and durable constructionof detachable trolley harp by which the operation of attaching anddetaching the hoop to and from the pole may be accomplishedexpeditiously.

Having thus described the invention, what is claimed as new is:

1. In combination, a trolley harp provided with a socket extendingtherethrough and with outwardly facing shoulders communicating with saidsocket, of a pole adapted to be inserted within said socket andoutwardly facing spring hooks secured to the end of said pole andarranged to slip through said socket and spring outwardly intoengagement with said shoulders.

2. In combination with a trolley harp provided with a socket extendingtherethrough and with outwardly facing shoulders communicating with saidsocket, of a trolley pole provided with a reduced shank adapted to beslipped into said socket and with oppositely facing recesses at theextremity of said shank and spring hooks secured in said recesses andfacing away from each other whereby when the shank is slipped into thesocket the said hooks will spring outwardly into engagement with theshoulders and fasten the harp to the pole.

In testimony whereof I afliX my signature in presence of two witnesses.

BENJAMIN L. DRESSER. INitnesses:

WM. J. TAFT, 7M. L. WHITMORE.

